Those preferring text can read a few transcribed excerpts below. Hansen proves himself, as always, somewhat inconvenient for almost everyone.

To me, for example, Hansen’s far too confident about the scale at which nuclear power, particularly the new technologies that he prefers, could be deployed by the middle of this century.

But his statements pose a particularly tough challenge for those who embrace his take on the dangers attending an unabated greenhouse-gas buildup but see a fast transition to solar, wind and other renewable energy sources as the solution. Here he reprises the points he made in a 2011 essay, “Baby Lauren and the Kool-Aid“:

Can renewable energies provide all of society’s energy needs in the foreseeable future? It is conceivable in a few places, such as New Zealand and Norway. But suggesting that renewables will let us phase rapidly off fossil fuels in the United States, China, India, or the world as a whole is almost the equivalent of believing in the Easter Bunny and Tooth Fairy.

Here are some excerpts, starting with a basic endorsement of nuclear power plants:

I think the only hope we have of phasing down emissions and getting to the middle of the century with a much lower level of fossil fuel emissions — which is what we will have to do if we want young people to have a future — we’re going to have to have alternatives and at this time nuclear seems to be the best candidate.

Following a discussion of the lessons from the great earthquake and tsunami that badly damaged Japan’s Fukushima Daiichi power plant, he focuses on more resilient reactor designs:

But with the new technologies, they are passively safe in the sense that if there is an anomaly like an earthquake or tsunami or both, it will just shut down and they don’t require power to cool them.

He discusses the merits and limits of energy efficiency as a path to lower greenhouse gas emissions:

It’s useful to show that you can have a lifestyle which produce less carbon, but it doesn’t solve the problem. Because if that’s all that happens, even if you convince a thousand people or a million people or a billion people to reduce their emissions what it does is reduce the demand for the fuel, lowers its price and somebody else will burn it.

Here’s what he says about renewable energy:

I think it’s unfortunate that so many environmentalists are just assuming that these renewable energies will be able to satisfy all of our requirements. Renewables are only providing between 1 and 2 percent — the soft renewables. Hydropower provides a significant amount of electricity but that’s limited. The hope that the wind and the sun and geothermal can provide all of our energy is a nice idea but I find it unlikely that that’s possible.

The environmental community is basically asking governments to try to reduce their emissions and asking them to subsidize clean energies. Well, that simply doesn’t work because we don’t get enough energy from the renewables to make a difference. And that then forces any government to approve expanded oil drilling, hydro-fracking to get more gas, mountaintop removal to get coal. We’re not going to turn the lights out. No government, no president or governor is going to turn out the lights. There has to be energy. If renewables aren’t providing it, it’s been fossil fuels.

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By 2050 or so, the human population is expected to pass nine billion. Those billions will be seeking food, water and other resources on a planet where humans are already shaping climate and the web of life. Dot Earth was created by Andrew Revkin in October 2007 -- in part with support from a John Simon Guggenheim Fellowship -- to explore ways to balance human needs and the planet's limits.